Dynamic active-site generation of atomic iridium stabilized on nanoporous metal phosphides for water oxidation

Kang Jiang, Min Luo, Ming Peng, Yaqian Yu, Ying-Rui Lu, Ting-Shan Chan, Pan Liu, Frank M. F. Groot and Yongwen Tan ()
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Kang Jiang: Hunan University
Min Luo: Shanghai Polytechnic University
Ming Peng: Hunan University
Yaqian Yu: Hunan University
Ying-Rui Lu: National Synchrotron Radiation Research Center
Ting-Shan Chan: National Synchrotron Radiation Research Center
Pan Liu: Shanghai Jiao Tong University
Frank M. F. Groot: Utrecht University, Universiteitsweg 99
Yongwen Tan: Hunan University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Designing efficient single-atom catalysts (SACs) for oxygen evolution reaction (OER) is critical for water-splitting. However, the self-reconstruction of isolated active sites during OER not only influences the catalytic activity, but also limits the understanding of structure-property relationships. Here, we utilize a self-reconstruction strategy to prepare a SAC with isolated iridium anchored on oxyhydroxides, which exhibits high catalytic OER performance with low overpotential and small Tafel slope, superior to the IrO2. Operando X-ray absorption spectroscopy studies in combination with theory calculations indicate that the isolated iridium sites undergo a deprotonation process to form the multiple active sites during OER, promoting the O–O coupling. The isolated iridium sites are revealed to remain dispersed due to the support effect during OER. This work not only affords the rational design strategy of OER SACs at the atomic scale, but also provides the fundamental insights of the operando OER mechanism for highly active OER SACs.

Date: 2020
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DOI: 10.1038/s41467-020-16558-1

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